Back bracket for a chair



FIG. 1 is a perspective view of a back bracket for a chair showing our new design.

FIG. 2 is a left side view, the right side view being a mirror image thereof.

FIG. 3 is a front view.

FIG. 4 is a rear view; and,

FIG. 5 is bottom view.

The broken line showing of a chair is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a back bracket for a chair, as shown and described. 